in reply to substituting values in an array
if ($array[$i] gt '200') { # ...
Good solutions have been provided to you, I would just like to point out to a severe error in your code that has not been picked up so far if I have read correctly.
If you want to compare numbers numerically (I mean arithmetical comparison), don't use the gt operator. If your array contains the element 1500, this will be deemed to be smaller than 200, because gt makes some form of lexical (or lexicographical, whatever) comparison (and 1 is smaller than 2). This is obviously not what you want. In brief, in such a case you want to use the > operator, rather than gt.
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